一种半波长交流输电线路的双灵敏度贝瑞隆差动保护方法
申请公布号:CN106300295A
申请号:CN201610808541.6
申请日期:2016.09.07
申请公布日期:2017.01.04
发明人:陆金凤;赵青春;朱晓彤;谢华;李奔;徐晓春
分类号:H02H7/26(2006.01)I
主分类号:H02H7/26(2006.01)I
代理人:闫方圆;董建林
地址:211102 江苏省南京市江宁区苏源大道69号
摘要:本发明公开了一种半波长交流输电线路的双灵敏度贝瑞隆差动保护方法,包括A)设置双灵敏度贝瑞隆差动保护判据,实现对半波长交流输电线路全线区内故障的保护;B)根据输电线路贝瑞隆模型,计算半波长交流输电线路两端的差动电流;C)判断低灵敏度贝瑞隆差动保护判据是否满足动作条件;D)判断高灵敏度贝瑞隆差动保护判据是否满足动作条件;E)实现半波长交流输电线路全长的差动保护。本发明采用低灵敏度贝瑞隆差动保护判据,保证快速切除线路区内两端区域短路故障;采用高灵敏度贝瑞隆差动保护判据,保证半波长线路区内中间段区域短路故障时可靠动作,区外短路时可靠不动作,能够可靠保护半波长交流输电线路的全长,具有良好的应用前景。
主权项:一种半波长交流输电线路的双灵敏度贝瑞隆差动保护方法,其特征在于:包括以下步骤,步骤(A),设置双灵敏度贝瑞隆差动保护判据,实现对半波长交流输电线路全线区内故障的保护;步骤(B),根据输电线路贝瑞隆模型,计算半波长交流输电线路两端的差动电流;步骤(C),根据半波长交流输电线路两端的差动电流,判断低灵敏度贝瑞隆差动保护判据是否满足动作条件;步骤(D),根据半波长交流输电线路两端的差动电流,判断高灵敏度贝瑞隆差动保护判据是否满足动作条件;步骤(E),若低灵敏度贝瑞隆差动保护判据或者高灵敏度贝瑞隆差动保护判据中任一个满足动作条件,则判定半波长交流输电线路发生区内故障,贝瑞隆差动保护动作,实现半波长交流输电线路全长的差动保护。
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